Buggy code:
private final String userInfo ; private final String host ; private final int port ; private final HierarchicalUriComponents . PathComponent path ; private final MultiValueMap < String , String > queryParams ; private final boolean encoded ; HierarchicalUriComponents ( String scheme , String userInfo , String host , int port , HierarchicalUriComponents . PathComponent path , MultiValueMap < String , String > queryParams , String fragment , boolean encoded , boolean verify ) { } @ Override public String getSchemeSpecificPart ( ) { } @ Override public String getUserInfo ( ) { } @ Override public String getHost ( ) { } @ Override public int getPort ( ) { } @ Override public String getPath ( ) { return this . path . getPath ( ) ; } @ Override public List < String > getPathSegments ( ) { } @ Override public String getQuery ( ) { } @ Override public MultiValueMap < String , String > getQueryParams ( ) { } @ Override public HierarchicalUriComponents encode ( String encoding ) throws UnsupportedEncodingException { } static String encodeUriComponent ( String source , String encoding , HierarchicalUriComponents . Type type ) throws UnsupportedEncodingException { } private static byte [ ] encodeBytes ( byte [ ] source , HierarchicalUriComponents . Type type ) { } private HierarchicalUriComponents . Type getHostType ( ) { } private void verify ( ) { } private static void verifyUriComponent ( String source , HierarchicalUriComponents . Type type ) { } @ Override protected HierarchicalUriComponents expandInternal ( UriTemplateVariables uriVariables ) { } @ Override public UriComponents normalize ( ) { } @ Override public String toUriString ( ) { } @ Override public URI toUri ( ) { } @ Override public boolean equals ( Object obj ) { } @ Override public int hashCode ( ) { } static enum Type { SCHEME ( ) { @ Override public boolean isAllowed ( int c ) { } } , AUTHORITY ( ) { @ Override public boolean isAllowed ( int c ) { } } , USER_INFO ( ) { @ Override public boolean isAllowed ( int c ) { } } , HOST_IPV4 ( ) { @ Override public boolean isAllowed ( int c ) { } } , HOST_IPV6 ( ) { @ Override public boolean isAllowed ( int c ) { } } , PORT ( ) { @ Override public boolean isAllowed ( int c ) { } } , PATH ( ) { @ Override public boolean isAllowed ( int c ) { } } , PATH_SEGMENT ( ) { @ Override public boolean isAllowed ( int c ) { } } , QUERY ( ) { @ Override public boolean isAllowed ( int c ) { } } , QUERY_PARAM ( ) { @ Override public boolean isAllowed ( int c ) { } } , FRAGMENT ( ) { @ Override public boolean isAllowed ( int c ) { } } ; public abstract boolean isAllowed ( int c ) { } protected boolean isAlpha ( int c ) { } protected boolean isDigit ( int c ) { } protected boolean isGenericDelimiter ( int c ) { } protected boolean isSubDelimiter ( int c ) { } protected boolean isReserved ( char c ) { } protected boolean isUnreserved ( int c ) { } protected boolean isPchar ( int c ) { } } interface PathComponent extends Serializable { String getPath ( ) ; List < String > getPathSegments ( ) { } HierarchicalUriComponents . PathComponent encode ( String encoding ) throws UnsupportedEncodingException { } void verify ( ) { } HierarchicalUriComponents . PathComponent expand ( UriTemplateVariables uriVariables ) { } } static final class FullPathComponent implements HierarchicalUriComponents . PathComponent { private final String path ; public FullPathComponent ( String path ) { } @ Override public String getPath ( ) { <START_BUG> return path ; <END_BUG> } @ Override public List < String > getPathSegments ( ) { } @ Override public HierarchicalUriComponents . PathComponent encode ( String encoding ) throws UnsupportedEncodingException { } @ Override public void verify ( ) { } @ Override public HierarchicalUriComponents . PathComponent expand ( UriTemplateVariables uriVariables ) { } @ Override public boolean equals ( Object obj ) { } @ Override public int hashCode ( ) { } } static final class PathSegmentComponent implements HierarchicalUriComponents . PathComponent { private final List < String > pathSegments ; public PathSegmentComponent ( List < String > pathSegments ) { } @ Override public String getPath ( ) { StringBuilder pathBuilder = new StringBuilder ( ) ; pathBuilder . append ( HierarchicalUriComponents . PATH_DELIMITER ) ; for ( Iterator < String > iterator = this . pathSegments . iterator ( ) ; iterator . hasNext ( ) ; ) { String pathSegment = iterator . next ( ) ; pathBuilder . append ( pathSegment ) ; if ( iterator . hasNext ( ) ) { pathBuilder . append ( HierarchicalUriComponents . PATH_DELIMITER ) ; } } return pathBuilder . toString ( ) ; } @ Override public List < String > getPathSegments ( ) { } @ Override public HierarchicalUriComponents . PathComponent encode ( String encoding ) throws UnsupportedEncodingException { } @ Override public void verify ( ) { } @ Override public HierarchicalUriComponents . PathComponent expand ( UriTemplateVariables uriVariables ) { } @ Override public boolean equals ( Object obj ) { } @ Override public int hashCode ( ) { } } static final class PathComponentComposite implements HierarchicalUriComponents . PathComponent { private final List < HierarchicalUriComponents . PathComponent > pathComponents ; public PathComponentComposite ( List < HierarchicalUriComponents . PathComponent > pathComponents ) { } @ Override public String getPath ( ) { StringBuilder pathBuilder = new StringBuilder ( ) ; for ( HierarchicalUriComponents . PathComponent pathComponent : this . pathComponents ) { pathBuilder . append ( pathComponent . getPath ( ) ) ; } return pathBuilder . toString ( ) ;

Fix:
return this . path ;